Police in riot gear march towards protestors, who were demanding justice for Michael Brown, near the Edward Jones Dome, the site of an NFL football game between the St. Louis Rams and the Oakland Raiders, in downtown St. Louis, Missouri November 30, 2014. (Adrees Latif/Reuters)
Eugene Robinson
By Eugene Robinson Opinion writer December 1 

Michael Brown’s death was part of a tragic and unacceptable pattern: Police officers in the United States shoot and kill civilians in shockingly high numbers. How many killings are there each year? No one can say for sure, because police departments don’t want us to know.
According to the FBI’s Uniform Crime Report, in 2013 there were 461 “justifiable homicides” by police — defined as “the killing of a felon by a law enforcement officer in the line of duty.” In all but three of these reported killings, officers used firearms.
Eugene Robinson writes a twice-a-week column on politics and culture, contributes to the PostPartisan blog, and hosts a weekly online chat with readers. In a three-decade career at The Post, Robinson has been city hall reporter, city editor, foreign correspondent in Buenos Aires and London, foreign editor, and assistant managing editor in charge of the paper’s Style section. 
The true number of fatal police shootings is surely much higher, however, because many law enforcement agencies do not report to the FBI database. Attempts by journalists to compile more complete data by collating local news reports have resulted in estimates as high as 1,000 police killings a year. There is no way to know how many victims, like Brown, were unarmed.